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Math Help - Difficult Substution Problem

  1. #1
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    Difficult Substution Problem

    x[0,1] f(x)=sinx/1+x^2

    isn't 1+x^2 arctan?
    I wasn't sure how to approach this problem, I know sin/cos = tan, so would i use 1/2 x dx/1+x^2? I have no clue haha. Help please.
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  2. #2
    MHF Contributor
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    Talking

    As written, the integrand is as follows:

    \frac{\sin(x)}{1}\, +\, x^2

    I have a feeling you mean one of the following...?

    \mbox{a) }\,\frac{\sin(x)}{1\, +\, x^2}

    \mbox{b) }\,\sin\left(\frac{x}{1\, +\, x^2}\right)

    Please confirm or correct. Thank you!
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  3. #3
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    Quote Originally Posted by stapel View Post
    As written, the integrand is as follows:

    \frac{\sin(x)}{1}\, +\, x^2

    I have a feeling you mean one of the following...?

    \mbox{a) }\,\frac{\sin(x)}{1\, +\, x^2}

    \mbox{b) }\,\sin\left(\frac{x}{1\, +\, x^2}\right)

    Please confirm or correct. Thank you!

    I meant a
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  4. #4
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    so I guess no one understands this.
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